Running partner

When Amanda found out that Gwen, her grand-mother was a sportive during her youth, she jumped on the occasion. Amanda loved to run. But she never found someone enough motivated to run everyday with her. Surprised by her proposal to become her running partner, Gwen said she was now too old to do 10km everyday. But Amanda disagree, took a photo of her grandma with her mobile, and promised everything will be clear the next day.

The famous next day, Amanda came back in jogging suit and with some sport clothes and shoes for her grandma. Gwen was more and more confused as the clothes were not at her actual size and way too sexy for an old woman like her. But Amanda told her to take her mobile where an App was running and to just push the "activate button". Gwen obeyed and suddenly, her grey hair vanished as her wrinkles disappeared and, better, her body became as athletic as she was in her 20's.
Gwen was crazy : she was young again !
She was so full of energy that Amanda had to some hard way to follow her grandma. But she liked it : she finally had someone as happy as her to run.